I'm playing a level 16 Cunning Bard in DnD4e. The "melee" striker in our party is a Barbarian with a reach weapon (he also has a focus on charge attacks). Since I have access to all sorts of sliding ...

Are you able to make opportunity attacks if you're dazed and has the feat Persisent Threat?
Persistent Threat - While you are dazed, you can still flank enemies, and you can take an opportunity action ...